re PR tree-optimization/58640 (wrong code (segfaults) at -O3 on x86_64-linux-gnu)
PR tree-optimization/58640 * tree-ssa-threadupdate.c (mark_threaded_blocks): Truncate jump threading paths that cross over two loop entry points. * gcc.c-torture/execute/pr58640.c: New test. From-SVN: r203463
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